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Segment Information - Reconciliation of Operating Revenues (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ 32,981	$ 32,912
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	32,433	32,351
Corporate and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	611	617
Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ (63)	$ (56)

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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